/*---------------------------------------------------------------------------*\
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License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::wallCellWallFunctionFvPatchScalarField

Description
    Base class for wall functions that modify cell values

SourceFiles
    wallCellWallFunctionFvPatchScalarField.C

\*---------------------------------------------------------------------------*/

#ifndef wallCellWallFunctionFvPatchScalarField_H
#define wallCellWallFunctionFvPatchScalarField_H

#include "fixedValueFvPatchFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
            Class wallCellWallFunctionFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/

class wallCellWallFunctionFvPatchScalarField
:
    public fixedValueFvPatchScalarField
{
    // Private Data

        //- Tolerance used in weighted calculations
        static scalar tol_;

        //- Master patch index
        label masterPatchi_;

        //- Wall cell indices. Master patch only.
        autoPtr<labelList> wallCellsPtr_;

        //- Wall cell fractions; i.e., what proportion of the wall cell value
        //  gets overridden. Master patch only.
        autoPtr<scalarField> wallCellFractionPtr_;


protected:

    // Protected Member Functions

        // Access

            //- Return the master patch index
            inline label masterPatchIndex() const
            {
                return masterPatchi_;
            }

            //- Return the wall cell indices
            inline const labelList& wallCells() const
            {
                return wallCellsPtr_();
            }

            //- Return the wall cell fractions
            inline const scalarField& wallCellFraction() const
            {
                return wallCellFractionPtr_();
            }


        //- Initialise the master cell indices and fractions, and allocate the
        //  turbulence fields
        void initMaster();

        //- Sum values from a patch field into a cell field
        static void patchFieldAddToCellField
        (
            const fvPatch& fvp,
            const scalarField& pf,
            scalarField& vf
        );

        //- Average a set of patch fields into a wall cell field
        tmp<scalarField> patchFieldsToWallCellField
        (
            const PtrList<scalarField>& pfs
        ) const;


public:

    // Constructors

        //- Construct from patch, internal field and dictionary
        wallCellWallFunctionFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given wallCellWallFunctionFvPatchScalarField
        //  onto a new patch
        wallCellWallFunctionFvPatchScalarField
        (
            const wallCellWallFunctionFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fieldMapper&
        );

        //- Disallow copy without setting internal field reference
        wallCellWallFunctionFvPatchScalarField
        (
            const wallCellWallFunctionFvPatchScalarField&
        ) = delete;

        //- Copy constructor setting internal field reference
        wallCellWallFunctionFvPatchScalarField
        (
            const wallCellWallFunctionFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new wallCellWallFunctionFvPatchScalarField(*this, iF)
            );
        }


    //- Destructor
    virtual ~wallCellWallFunctionFvPatchScalarField()
    {}


    // Member Functions

        // Mapping functions

            //- Map the given fvPatchField onto this fvPatchField
            virtual void map(const fvPatchScalarField&, const fieldMapper&);

            //- Reset the fvPatchField to the given fvPatchField
            //  Used for mesh to mesh mapping
            virtual void reset(const fvPatchScalarField&);


    // Member Operators

        //- Inherit assignment
        using fvPatchScalarField::operator=;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
